Question

consider methane (ch4)
how many molecules of methane do we have?
how many total carbon atoms do we have?
how many total hydrogen atoms do we have?

Explanation:

Step1: Identify number of methane molecules

The coefficient in front of $CH_4$ is 2, so there are 2 molecules of methane.

Step2: Count carbon atoms

Each $CH_4$ molecule has 1 carbon atom. With 2 molecules, the total number of carbon atoms is $2\times1 = 2$.

Step3: Count hydrogen atoms

Each $CH_4$ molecule has 4 hydrogen atoms. With 2 molecules, the total number of hydrogen atoms is $2\times4=8$.

Answer:

How many molecules of methane do we have? 2
How many TOTAL atoms of carbon do we have? 2
How many TOTAL atoms of hydrogen do we have? 8